Optical module and terminal device

Abstract

The application discloses an optical module and a terminal device, and relates to the field of terminal devices. The optical module comprises: an image sensor configured to receive a first light beam having a first wavelength; a light source emitter configured to emit a second light beam having a second wavelength, the first wavelength being different from the second wavelength; and a light splitting member configured to adjust a propagation direction of the first light beam projected onto a light splitting surface, and project the first light beam with the adjusted propagation direction onto the image sensor; the light splitting member is also configured to adjust a propagation direction of the second light beam projected onto the light splitting surface, and emit the second light beam with the adjusted propagation direction, the emission direction of the adjusted second light beam being opposite to the incidence direction of the first light beam. In this way, by designing the first light beam and the second light beam to share an optical path, the area of a hole region for light beam input and output on a display screen of the terminal device can be reduced while the light beam input and output performance of the display screen is ensured, so that the integrity of a picture is improved.

Description

Technical Field

[0001] This application relates to the field of terminal equipment, and more particularly to an optical module and a terminal device. Background Technology

[0002] With the widespread adoption and iterative upgrades of terminal devices, their functional requirements are becoming increasingly diversified. Terminal devices often include front-facing cameras and laser transceivers. The front-facing camera focuses on image capture to meet users' daily shooting needs such as selfies and video calls. The laser transceiver, as the core component of 3D face unlock technology, emits a laser beam to scan the user's face and receives the reflected beam through a laser receiver, quickly constructing a high-precision 3D face model. This allows users to unlock instantly without manually entering a password or fingerprint; they simply need to face the device. This greatly improves the convenience and smoothness of use, bringing users an efficient and intelligent interactive experience.

[0003] However, the front-facing camera and laser transceiver require separate openings on the screen for light to enter and exit. These openings not only occupy a large screen area but also disrupt the integrity of the screen, creating a sense of fragmentation in the display area. This, in turn, affects the integrity of the image display and the visual immersion, thus weakening the user experience. Summary of the Invention

[0004] Embodiments of this application provide an optical module and terminal device that can reduce the area of ​​the punch-hole region on the display screen used for beam input and output while ensuring the beam input and output performance on the display screen of the terminal device.

[0005] In a first aspect, this application provides an optical module comprising: an image sensor for receiving a first light beam having a first wavelength; a light source emitter for emitting a second light beam having a second wavelength, wherein the first wavelength is different from the second wavelength; and a beam splitter including a beam splitting surface; the beam splitter is used to adjust the propagation direction of the first light beam projected onto the beam splitting surface and project the first light beam with adjusted propagation direction onto the image sensor; the beam splitter is also used to adjust the propagation direction of the second light beam projected onto the beam splitting surface and emit the second light beam with adjusted propagation direction, wherein the emission direction of the adjusted second light beam is opposite to the incident direction of the first light beam.

[0006] In this embodiment, after the beam splitter adjusts the propagation directions of the first beam input from the outside and the second beam emitted from the light source emitter in the optical module, the emission direction of the second beam is opposite to the incident direction of the first beam. That is, the emission path of the second beam and the incident path of the first beam are coincident to a certain extent, thereby realizing the sharing of the optical paths of the first beam and the second beam. At this time, there is no need to set up separate optical path channels for the input of the first beam or the output of the second beam.

[0007] For the terminal device housing the optical module, the first beam is the beam entering the optical module during the shooting scene. This first beam is used to create an image in the image sensor, enabling functions such as selfies and video calls. The second beam is the beam output by the terminal device for scanning the user's face, enabling 3D face unlock. Based on this optical module, since the first and second beams share the same optical path, it does not affect the input effect of the first beam entering the terminal device or the output effect of the second beam exiting the terminal device, thus ensuring the shooting and face unlock performance of the terminal device. Furthermore, sharing the optical path allows for the sharing of light-passing holes, thereby reducing the number of holes required on the display module and decreasing the area of ​​the cutouts. This allows for a more complete screen display, improving the integrity of the image displayed on the display module and enhancing the user's visual immersion. It also gives the terminal device a more refined appearance and improves the user experience.

[0008] In one embodiment, the beam splitter includes a first prism, which includes a beam splitting surface; the first prism is used to reflect a first beam projected onto the beam splitting surface and to emit the reflected first beam, and an image sensor is disposed on the reflected light path of the first beam; the first prism is also used to transmit a second beam projected onto the beam splitting surface and to emit the transmitted second beam.

[0009] In one embodiment, the optical module further includes a first mirror group disposed between the beam splitter and the image sensor; the first mirror group is used to converge the first beam reflected from the beam splitter to the first mirror group and adjust the propagation direction of the converged first beam, the emission direction of the adjusted first beam being parallel to the optical axis of the image sensor.

[0010] In this embodiment, the first lens group converges and adjusts the optical path of the first beam from the outside, ensuring that the first beam is emitted as parallel as possible to the optical axis of the image sensor. This guarantees that the first beam is perpendicularly incident on the image sensor, thereby forming a regular, clear, and distortion-free image on the image sensor and ensuring the imaging quality. Furthermore, when the optical module is installed in the terminal device, the placement of the first lens group meets the imaging requirements of the image sensor while making full use of the under-screen space of the display module, reducing the size of the optical module and improving the overall compactness of the terminal device.

[0011] In one embodiment, the optical module further includes a second prism disposed between the beam splitting surface and the light source emitter; the second prism is used to adjust the propagation direction of the second beam projected onto the second prism and to project the second beam with the adjusted propagation direction onto the beam splitting surface, wherein the exit direction of the adjusted second beam through the beam splitting surface is opposite to the incident direction of the first beam.

[0012] In this embodiment, because the second beam emitted from the light source emitter is easily refracted in the first prism, it is deflected when it exits the first prism, which affects the accuracy of face recognition. By placing a second prism between the beam splitter and the light source emitter, the exit direction of the second beam emitted from the light source emitter is pre-adjusted. The adjusted second beam is then projected onto the first prism, ensuring that the second beam does not deflect after passing through both the second and first prisms. This calibrates the exit direction of the second beam, thereby ensuring its exit effect and ultimately guaranteeing the accuracy and efficiency of 3D face recognition when the terminal device uses the second beam emitted from the optical module.

[0013] In one embodiment, the optical module further includes a substrate, a light source emitter is disposed on the substrate, a beam splitter forms a first angle with the plane of the substrate, and an incident surface of the image sensor forms a second angle with the plane of the substrate, the second angle increasing as the first angle increases.

[0014] In this embodiment, by designing the angles at which the beam-splitting surface of the first prism and the incident surface of the image sensor are placed in the optical module, the first beam can be accurately projected onto the image sensor after being reflected by the beam-splitting surface of the first prism, thereby ensuring the imaging effect of the first beam on the image sensor and ensuring that the adjustment of the incident light path of the first beam does not affect the shooting performance of the terminal device.

[0015] In one embodiment, the optical module further includes a substrate and a third prism. The light source emitter and the image sensor are disposed on the substrate, and the third prism is disposed on the outgoing light path of the first light beam emitted from the first mirror group. The third prism includes a reflective surface and is used to reflect the first light beam projected onto the reflective surface to the image sensor.

[0016] In this embodiment, by using a third prism to adjust the emission direction of the first beam emitted from the first mirror group, the placement position of the image sensor within the optical module can be adjusted. This allows the size of the image sensor to no longer be limited by the limited space between the display module of the terminal device and the substrate of the optical module. Since the image sensor can now be placed on the substrate of the optical module, increasing its size allows it to accommodate more pixels, enabling it to capture richer details and thus improving its imaging performance.

[0017] In one embodiment, the beam splitter includes a fourth prism, which includes a beam splitting surface; the fourth prism is used to transmit a first beam projected onto the beam splitting surface and to emit the transmitted first beam, and the image sensor is disposed on the transmission path of the first beam; the fourth prism is also used to reflect a second beam projected onto the beam splitting surface and to emit the reflected second beam.

[0018] In one embodiment, the optical module further includes a second mirror group disposed between the beam splitter and the image sensor; the second mirror group is used to converge the first beam transmitted from the beam splitter to the second mirror group and adjust the propagation direction of the converged first beam, the emission direction of the adjusted first beam being parallel to the optical axis of the image sensor.

[0019] In one embodiment, the optical module further includes a substrate, an image sensor disposed on the substrate, a beam splitting surface forming a third angle with the plane of the substrate, and a light emitting surface of the light source emitter forming a fourth angle with the plane of the substrate, the fourth angle increasing as the third angle increases.

[0020] In this embodiment, since the beam splitter including the fourth prism is configured to transmit the first beam and reflect the second beam, compared with the above embodiment, the positions of the image sensor and the light source emitter in the optical module can be adjusted, and the image sensor can be placed on the substrate. At this time, the application of the second mirror group in the optical module is equivalent to the application of the first mirror group in the optical module in the above embodiment, making full use of the under-screen space of the display module, reducing the volume of the optical module, and improving the overall compactness of the terminal device.

[0021] In one embodiment, the optical module further includes a filter; the filter is disposed at the light incident point of the image sensor, and the filter is used to transmit the first light beam and reflect the second light beam.

[0022] In this embodiment, by setting a filter at the light incident point of the image sensor, since the filter can transmit the first light beam and reflect the second light beam, the second light beam is prevented from interfering with the image sensor's imaging by being projected onto the image sensor, thereby improving the image quality of the image sensor.

[0023] In one embodiment, the optical module further includes a third mirror group; the third mirror group is disposed on the incident light path of the first beam, and is used to converge the first beam projected onto the third mirror group and project the converged first beam onto the beam splitting surface; the third mirror group is also used to diverge the second beam projected onto the third mirror group and emit the diverged second beam.

[0024] In this embodiment, the third lens group and the first or second lens group described above can be combined to form a lens in the front-facing camera that includes multiple optical lenses. When the optical module is installed in the terminal device, the third lens group can make full use of the opening space of the light-transmitting hole on the display module, while the first or second lens group utilizes the under-screen space between the substrate of the display module and the optical module, thereby reducing the volume of the optical module. Furthermore, by adjusting the first beam with the two lens groups, the first beam can be accurately projected onto the image sensor to form a clear image.

[0025] Secondly, embodiments of this application provide a terminal device, including a display module, a circuit board, and the optical module provided in the first aspect above; the optical module is disposed on the circuit board, and the optical module is used to receive a first light beam having a first wavelength and to emit a second light beam having a second wavelength, wherein the first wavelength and the second wavelength are different; the display module includes a first light-transmitting hole, which is used for the first light beam to pass through the first light-transmitting hole and be projected onto the optical module, and the first light-transmitting hole is also used for the second light beam to pass through the first light-transmitting hole and be emitted.

[0026] In this embodiment, when the optical module is installed in the terminal device, the optical path of the second beam emitted from the optical module is shared with the optical path of the first beam incident on the optical module after the propagation path of the beam inside the optical module is designed. There is no need to set up separate channels for the input of the first beam or the output of the second beam on the display module. By reducing the number of through holes required on the display module, the area of ​​the hole on the display module is reduced, and the proportion of the display area on the display module is increased. Thus, by reducing the number of through holes required on the display module of the terminal device, the area of ​​the hole on the display module is reduced, enabling the terminal device to achieve a more complete screen display. This improves the integrity of the image display on the display module and the visual immersion of the user's viewing content, and brings a more refined appearance to the terminal device, thus improving the user experience.

[0027] In one embodiment, the terminal device further includes a light source receiver disposed on the circuit board, which is used to receive a second light beam.

[0028] In one embodiment, the display module further includes a second light-transmitting aperture for a second light beam to pass through and be projected onto a light source receiver.

[0029] In this embodiment, by setting a second light-passing hole to allow the second light beam to enter the terminal device, and by setting a light source receiver to work in conjunction with the light source emitter in the optical module, the face unlock function of the terminal device can be realized.

[0030] In one embodiment, the display module further includes a beam incident area, a portion of which is made of a light-transmitting material to form multiple light-transmitting channels in the beam incident area. The light-transmitting channels are used for a second beam to be projected onto a light source receiver through the light-transmitting channels.

[0031] In this embodiment, a beam incident area is set instead of a second light-transmitting hole on the display module. Since a local area of ​​the beam incident area is made of a light-transmitting material, multiple light-transmitting channels are formed in the beam incident area for the second beam to enter, thereby reducing the number of light-transmitting holes opened on the display module. This allows the terminal device to achieve a more complete screen display, thereby improving the integrity of the image display on the display module and the visual immersion of the user watching the content.

[0032] In this embodiment, the beneficial effects of the second aspect can also be referred to the description of the first aspect and any of its implementations, which will not be repeated here. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a terminal device;

[0034] Figure 2 This is a schematic diagram of the structure of an optical module provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of a terminal device provided in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of another optical module provided in an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of another optical module provided in an embodiment of this application;

[0038] Figure 6 A front view of a display module provided in an embodiment of this application;

[0039] Figure 7 This is a schematic diagram of the structure of another optical module provided in the embodiments of this application;

[0040] Figure 8 A front view of another display module provided in an embodiment of this application;

[0041] Figure 9 This is a schematic diagram of the structure of another terminal device provided in an embodiment of this application;

[0042] Figure 10 This is a schematic diagram of the structure of a display module provided in an embodiment of this application. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Before introducing the embodiments involved in this application, some technical terms related to the embodiments of this application will be introduced first.

[0045] Wavelength of light: Wavelength refers to the distance that light, as an electromagnetic wave, travels within one vibration cycle. Light exhibits wave-particle duality, displaying wave-like characteristics during propagation. Wavelength is an important physical quantity describing these wave-like properties. Different colors of light correspond to different wavelength ranges, and different wavelengths of light have different properties and applications. For example: Infrared light: Its wavelength is between microwaves and visible light, approximately between 750nm and 1000nm. It has a thermal effect and is often used in remote control, thermal imaging, and infrared communication. Visible light: Its wavelength is between 380nm and 760nm, which is the range of electromagnetic waves that the human eye can perceive. Different wavelengths of visible light correspond to different colors; for example, red light has a longer wavelength, approximately 700nm, while violet light has a shorter wavelength, approximately 400nm.

[0046] Wavelength range: For example, when the wavelength range of a light beam is 380nm to 750nm, it means that the wavelength range of the light beam is between 380nm and 750nm, including both 380nm and 750nm wavelengths.

[0047] For example, when the first beam has a first wavelength, the second beam has a second wavelength:

[0048] Different wavelengths: This means that the wavelength range of the first wavelength of the first beam does not overlap with the wavelength range of the second wavelength of the second beam. For example, if the wavelength range of the first wavelength is 380nm to 750nm and the wavelength range of the second wavelength is 700nm to 1000nm, then the wavelengths are considered to be different.

[0049] Same wavelength range: This means that the wavelength range of the first wavelength partially overlaps with that of the second wavelength. For example, if the wavelength range of the first wavelength is 380nm to 750nm and the wavelength range of the second wavelength is 500nm to 1000nm, then the wavelength range is considered to be the same.

[0050] Same wavelength: This means that the wavelength range of the first wavelength completely overlaps with the wavelength range of the second wavelength. For example, if the wavelength range of the first wavelength is 380nm to 750nm, and the wavelength range of the second wavelength is also 380nm to 750nm, then the wavelengths are considered to be the same.

[0051] Field of view (FOV): The angle between the two edges of the lens, which is the maximum range through which the image of the target object can pass through the lens, is called the field of view. The size of the field of view determines the field of view of the optical element. The larger the field of view, the larger the field of view, but the smaller the optical magnification. Areas of the target object that exceed the field of view will not be captured by the lens.

[0052] Before providing a detailed explanation of the embodiments of this application, the application scenarios of these embodiments will be described first.

[0053] In terminal devices such as mobile phones, tablets, computers, and smartwatches, front-facing cameras are used to meet users' daily needs for selfies and video calls. As users' demands for front-facing camera image quality increase, light-transmitting holes are incorporated into the screen of these devices to ensure high light transmittance and meet the imaging requirements of the front-facing camera. Additionally, these devices often incorporate laser emitters and receivers to enable 3D face unlocking. This allows users to unlock instantly by simply aligning their face with the device, eliminating the need for manual passwords or fingerprints, providing a faster and more natural unlocking experience. However, laser emitters and receivers typically require two light-transmitting holes on the screen to handle light emission and reception, respectively.

[0054] However, to achieve the above functions and ensure a better experience with front-facing camera and 3D face unlock, the hardware requires corresponding light-passing holes to be opened on the display screen of the terminal device for both the front-facing camera and the laser transceiver. This provides a channel for external light to enter the terminal device or for internal light to exit from the terminal device to the outside. Such light-passing holes not only occupy a large screen area but also damage the integrity of the screen, creating a sense of fragmentation in the display area, which in turn affects the integrity of the image display and the visual immersion, thus weakening the user experience.

[0055] Therefore, for terminal devices, since a more complete screen display can improve the integrity of the image display and the visual immersion of the user's viewing content, and bring a more refined appearance to the terminal device, thereby improving the user experience, the display screen of terminal devices always pursues the ultimate display area ratio and fewer punch-hole designs.

[0056] In some implementations, please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a terminal device 1. For example... Figure 1 As shown, terminal device 1 includes a display module 11, a front-facing camera 12, and a laser emitter 13.

[0057] In this embodiment, the image sensor and laser emitter 13 are disposed on the circuit board of the terminal device 1. Figure 1 (Not shown in the image) By increasing the local transmittance of the display module 11 in the areas corresponding to the front-facing camera 12 and the laser emitter 13, channels for light intake and exhaust are provided. Specifically, the display module 11 is designed with unidirectional light-transmitting materials in the areas corresponding to the front-facing camera 12 and the laser emitter 13, reducing light crosstalk while increasing the local transmittance of the display module 11. Thus, by designing the display module 11, a hole-free design is achieved while ensuring that the terminal device 1 can perform front-facing photography and 3D face unlock functions, improving the integrity and visual immersion of the image displayed on the display module 11 of the terminal device 1.

[0058] However, the hole-free design of the display module 11 requires high light transmittance, necessitating extensive masking processes and increasing manufacturing costs. Furthermore, the complex optical path introduces diffraction noise, requiring specific filtering devices and algorithms in the terminal device 1 to eliminate this noise. This not only increases the application cost of the terminal device 1 but also compromises the imaging quality of the front-facing camera 12. Moreover, when the laser emitter 13 emits a beam below the display module 11, leakage current causes instability in the output beam intensity, inevitably resulting in flickering visible to the user in some scenarios, affecting the image display's clarity. Leakage current refers to additional, unwanted current flow beyond the normal current path used to generate the beam during normal laser emitter 13 operation. Therefore, while reducing the area of ​​the hole in the display module 11, the aforementioned solution not only increases the manufacturing cost of the terminal device 1 but also fails to guarantee the image quality of the front-facing camera 12 and the 3D face unlock functionality.

[0059] To address the aforementioned issues, this application provides an optical module that, by designing the input path of visible light to the image sensor and the output path of the laser beam output from the laser emitter 13, can simultaneously improve the front-facing camera 12's photo-taking capabilities and the 3D face unlock functionality, while also reducing the area of ​​the punch-hole region on the display module 11 of the terminal device 1. This enhances the integrity of the image display and the user's visual immersion in the content viewed, thereby improving the user experience.

[0060] The specific embodiments involved in this application are described in detail below with reference to the accompanying drawings.

[0061] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of an optical module 2 provided in an embodiment of this application. Figure 2 As shown, the optical module 2 provided in this embodiment includes an image sensor 21, a light source emitter 22, and a beam splitter 23.

[0062] In this embodiment, the image sensor 21 is used to receive a first light beam having a first wavelength, and the light source emitter 22 is used to emit a second light beam having a second wavelength. The first wavelength and the second wavelength are different, as explained above.

[0063] In some implementations, the first beam is visible light entering the optical module 2 in the shooting scene, while the second beam can be infrared light with a wavelength longer than visible light, which is not limited here.

[0064] Image sensor 21 is a component in the front-facing camera that converts visible light signals into electrical or digital signals to form an image. The second beam emitted from light source emitter 22 is reflected off the face, and the light source receiver in the terminal device receives the reflected beam to form an image. An algorithm extracts the biometric features of the face image to achieve 3D face imaging, and a difference comparison is performed with a pre-recorded face template to achieve face unlock functionality.

[0065] In some examples, the light source emitter 22 may include a dot matrix light source composed of multiple independent lasers arranged in a certain array. The light source emitter 22 may also be a surface light source for emitting uniform surface light, without limitation.

[0066] In this embodiment, the beam splitter 23 includes a beam splitting surface 231. For example, a filter film can be deposited on the beam splitter 23 to form the beam splitting surface 231. The beam splitter 23 may include a prism (such as a triangular prism) or a plane mirror coated with a filter film.

[0067] like Figure 2 The beam splitter 23 is located on the propagation paths of the first beam and the second beam, and both the first beam and the second beam can be projected onto the beam splitting surface 231 of the beam splitter 23. The first beam is... Figure 2 The black dashed line with an arrow in the middle indicates the second beam is... Figure 2 A solid black line with an arrow in the middle.

[0068] Beam splitter 23 is used to adjust the propagation direction of the first beam projected onto beam splitter 231 and project the first beam with adjusted propagation direction onto image sensor 21. Beam splitter 23 is also used to adjust the propagation direction of the second beam projected onto beam splitter 231 and emit the second beam with adjusted propagation direction, the emission direction of the adjusted second beam being opposite to the incident direction of the first beam. For example, when beam splitter 231 is used to reflect the first beam and transmit the second beam, beam splitter 23 is used to reflect the first beam projected onto beam splitter 231. At this time, image sensor 21 is positioned in the reflection direction of beam splitter 231, and beam splitter 23 is also used to transmit the second beam projected onto beam splitter 231 by light source emitter 22. When beam splitter 231 is used to transmit the first beam and reflect the second beam, beam splitter 23 is used to transmit the first beam projected onto beam splitter 231. At this time, image sensor 21 is positioned in the transmission direction of beam splitter 231, and beam splitter 23 is also used to reflect the second beam projected onto beam splitter 231 by light source emitter 22.

[0069] Furthermore, both the first and second beams contain multiple rays in different directions. Originally, the first and second beams propagate in a certain direction as a whole. The exit direction of the second beam is the overall propagation direction when it exits the optical module 2, and the incident direction of the first beam is the overall propagation direction when it enters the optical module 2. After the propagation direction is adjusted by the beam splitter 23, the overall propagation direction of the second beam when it exits the optical module 2 is opposite to the overall propagation direction of the first beam when it enters. This indicates that the exit optical path of the second beam and the incident optical path of the first beam coincide to a certain extent, achieving shared optical paths for both beams. Therefore, it is not necessary to set up a separate optical path channel for the second beam to exit.

[0070] Based on the above, Figure 2 The structure of the optical module 2 shown is used to describe the structure of the terminal device involved in this application. Please refer to [link / reference]. Figure 3 , Figure 3 This is a schematic diagram of the structure of a terminal device 1 provided in an embodiment of this application, as shown below. Figure 3 As shown, the terminal device 1 provided in this application embodiment includes a display module 11, a circuit board 14, and the optical module 2 described in the above embodiment.

[0071] In this embodiment, the optical module 2 is disposed on the circuit board 14. The optical module 2 is used to receive a first light beam with a first wavelength and emit a second light beam with a second wavelength. That is, after detecting the user's unlocking intention, the terminal device 1 controls the light source emitter in the optical module 2 to emit the second light beam, and the first wavelength is different from the second wavelength. After the propagation optical path of the second light beam inside the optical module 2 is designed, the optical path of the second light beam emitted from the optical module 2 is shared with the optical path of the first light beam entering the optical module 2. There is no need to set a separate optical path channel for the second light beam to be emitted, thereby reducing the number of light-transmitting holes opened on the display module 11. The circuit board 14 is a printed circuit board (PCB), which can be the motherboard or substrate of the terminal device 1, and is not limited here.

[0072] In this embodiment, the display module 11 includes a first light-transmitting hole 111. When the first light beam and the second light beam share the same optical path, they can share the first light-transmitting hole 111. That is, the first light-transmitting hole 111 is used for the first light beam to pass through the first light-transmitting hole 111 and be projected onto the optical module 2. The first light-transmitting hole 111 is also used for the second light beam to pass through the first light-transmitting hole 111 and be emitted.

[0073] Based on this, by designing the optical module 2 in the terminal device 1, the sharing of the optical path between the first and second beams does not affect the input effect of the first beam entering the terminal device 1 or the output effect of the second beam exiting the terminal device 1, thus ensuring the shooting performance and face unlocking performance of the terminal device 1. Furthermore, the sharing of the optical path between the two beams allows for the sharing of the light-passing aperture, thereby reducing the number of apertures required on the display module 11 and decreasing the area of ​​the cutouts on the display module 11. This increases the proportion of the display area on the display module 11, enabling the terminal device 1 to achieve a more complete screen display. This improves the integrity of the image displayed on the display module 11 and the user's visual immersion in the content, resulting in a more refined appearance for the terminal device 1 and ultimately enhancing the user experience.

[0074] In one implementation, such as Figure 4 As shown, Figure 4 This is a schematic diagram of another optical module provided in an embodiment of this application. In this embodiment, the optical module includes an image sensor 21, a light source emitter 22, and a beam splitter. The image sensor 21 is used to receive a first light beam having a first wavelength, and the light source emitter 22 is used to emit a second light beam having a second wavelength, the first wavelength being different from the second wavelength.

[0075] In this embodiment, the beam splitter includes a first prism 232, and the first prism 232 includes a beam-splitting surface 231. Combined with... Figure 3It is understood that the first prism 232 is disposed on the outgoing light path of the first beam entering the terminal device through the first light-transmitting aperture. The first prism 232 is used to reflect the first beam projected onto the beam-splitting surface 231 and emit the reflected first beam. The image sensor 21 is disposed on the reflected light path of the first beam. Furthermore, the first prism 232 is also used to transmit the second beam projected onto the beam-splitting surface 231 and emit the transmitted second beam. Since the emission direction of the second beam through the beam-splitting surface 231 is opposite to the incident direction of the first beam, the emitted second beam passes through the first light-transmitting aperture and exits outside the terminal device. For example, when the first beam is visible light and the second beam is infrared light, an infrared transmission filter film can be deposited on the first prism 232 to form the beam-splitting surface 231. The infrared transmission filter film is used to transmit the second beam in the infrared wavelength range and reflect the first beam in the visible wavelength range.

[0076] After the first beam of light enters the optical module and is reflected by the beam-splitting surface 231 of the first prism 232, in order to accurately project the first beam of light onto the image sensor 21 and form a clear image, the optical module is also provided with a first mirror group 24, which is disposed between the beam-splitting surface 231 and the image sensor 21. Figure 4 The first prism 232 is located on the propagation path of the first beam and the second beam, and both the first beam and the second beam can be projected onto the beam-splitting surface 231 of the first prism 232.

[0077] The first lens group 24 can be considered as a lens in a front-facing camera that includes multiple optical lenses. The first lens group 24 is used to converge the first light beam reflected from the beam splitter 231 and adjust the propagation direction of the converged first light beam. The adjusted emission direction of the first light beam is parallel to the optical axis of the image sensor 21. That is, the first lens group 24 refracts, converges, and adjusts the first light beam from the outside so that the first light beam is emitted as parallel as possible to the optical axis of the image sensor 21, so as to ensure that the first light beam is perpendicularly incident on the image sensor 21, thereby forming a regular, clear, and undistorted image on the image sensor 21. However, when the emission direction of the first light beam is not parallel to the optical axis of the image sensor 21, it may cause problems such as image tilting and distortion, affecting the image quality.

[0078] In some examples, the first lens group 24 can be composed of multiple convex lenses, concave lenses, and special lenses (such as aspherical lenses). The convex lenses are used to converge the light beam, while the concave lenses diverge the light beam. The special lenses can be used to adjust the direction of light beam propagation and correct aberrations and distortions. For example, after the first light beam is converged by the convex lens, it is then corrected for aberrations and its divergence is controlled by the concave lens and the special lens. Thus, by properly combining the above lenses, the propagation path of the first light beam can be adjusted, and the imaging effect of the first light beam on the image sensor 21 can be optimized.

[0079] In this embodiment, the optical module further includes a substrate 25, a light source emitter 22 is disposed on the substrate 25, and the substrate 25 is disposed on the circuit board of the terminal device. (See attached image) Figure 3 Since the plane of the circuit board 14 in the terminal device 1 is parallel to the plane of the display module 11, the plane of the substrate disposed on the circuit board 14 is also parallel to the plane of the display module 11. Figure 4 In this configuration, the first prism 232 is positioned between the light source emitter 22 and the first light-transmitting hole on the display module. The second beam emitted from the light source emitter 22 is transmitted through the beam-splitting surface 231 of the first prism 232 and then exits through the first light-transmitting hole to reach the outside of the terminal device.

[0080] However, when the second beam emitted from the light source emitter 22 passes through the first prism 232, it is easily refracted, causing deflection. This results in the second beam emitted by the terminal device not accurately illuminating the surface of the object to be identified along the preset transmission path, leading to deviations in the acquired 3D data and ultimately affecting the accuracy of face recognition, potentially even causing recognition failure. Therefore, as... Figure 4 The optical module also includes a second prism 261 positioned between the beam-splitting surface 231 and the light source emitter 22. The second prism 261 adjusts the propagation direction of the second beam projected onto it and projects the adjusted beam onto the beam-splitting surface 231. The exit direction of the adjusted second beam through the beam-splitting surface 231 is opposite to the incident direction of the first beam. In other words, the second prism 261 pre-deflects the second beam emitted from the light source emitter 22. The deflected second beam is then projected onto the first prism 232. By designing the deflection effect of the second prism 261 on the second beam to cancel out the deflection effect of the first prism 232, the second beam exits without deflection after passing through the second prism 261 and the first prism 232. This achieves calibration of the exit direction of the second beam, thereby ensuring the accuracy and efficiency of 3D face recognition when the terminal device uses the second beam.

[0081] In one possible structure, the structure of the optical module can be found in [reference needed]. Figure 4 The light source emitter 22 is disposed on the substrate 25.

[0082] In this embodiment, since the first prism 232 is used to reflect the first beam projected onto the beam splitter 231 and transmit the second beam projected onto the beam splitter 231, in order to ensure that the first beam can be accurately projected onto the image sensor 21 after being reflected by the beam splitter 231 of the first prism 232, the angle at which the beam splitter 231 of the first prism 232 and the light incident surface of the image sensor 21 are placed in the optical module needs to be designed.

[0083] In this configuration, the beam-splitting surface 231 of the first prism 232 forms a first angle A1 with the plane containing the substrate 25, and the light-incident surface of the image sensor 21 forms a second angle A2 with the plane containing the substrate 25. The second angle A2 increases as the first angle A1 increases. Furthermore, when the first mirror group 24 is used only to adjust the divergence of the first beam and correct aberrations, without adjusting the output direction of the first beam, the second angle A2 can be twice the first angle A1. For example, if the incident direction of the first beam is perpendicular to the plane of the substrate 25, after reflection by the beam splitting surface 231 which forms a first angle A1 with the plane of the substrate 25, the angle between the first beam and the normal of the beam splitting surface 231 when the first beam is incident on the beam splitting surface 231 is equal to the first angle A1. After reflection, the angle between the first beam and the normal of the beam splitting surface 231 is also equal to the first angle A1. If the first beam needs to pass through the first mirror group 24 and be perpendicular to the light incident surface of the image sensor 21, the angle between the first beam and the plane of the substrate 25 should be 90 degrees - 2 * the first angle A1. Therefore, the second angle A2 between the light incident surface of the image sensor 21 and the plane of the substrate 25 is twice the first angle A1.

[0084] In another possible structure, the optical module is structured as follows: Figure 5 As shown, Figure 5 This is a schematic diagram of another optical module provided in an embodiment of this application. The optical module also includes a third prism 262, and the light source emitter 22 and image sensor 21 are all disposed on the substrate 25.

[0085] In this embodiment, the third prism 262 is disposed in the outgoing light path of the first beam emitted from the first mirror group 24. The third prism 262 includes a reflective surface and is used to reflect the first beam projected onto the reflective surface to the image sensor 21. When the first beam is visible light and the second beam is infrared light, an infrared transmission filter film can be deposited on the third prism 262 to form a reflective surface.

[0086] Thus, by adjusting the emission direction of the first beam emitted from the first mirror group 24 using the third prism 262, the placement position of the image sensor 21 within the optical module can be adjusted. By placing the image sensor 21 on the substrate 25 of the optical module, the size of the image sensor 21 is no longer limited by the limited space between the display module of the terminal device and the substrate 25 of the optical module. Furthermore, by increasing the size of the image sensor 21, it can accommodate more pixels. More pixels can capture richer details, and with sufficient first beam light, each pixel can receive more light to achieve imaging, thereby improving the imaging effect of the image sensor 21.

[0087] In some implementations, such as Figure 4 and Figure 5As shown, the optical module may further include a filter 27, which is disposed at the light incident point of the image sensor 21. The filter 27 is used to transmit the first light beam and reflect the second light beam. When the first light beam is visible light and the second light beam is infrared light, the filter 27 can be an infrared cutoff filter 27. The infrared cutoff filter 27 can transmit the first light beam in the visible light wavelength range and reflect the second light beam in the infrared light wavelength range, thus preventing the second light beam from interfering with the imaging of the image sensor 21 and improving the imaging quality of the image sensor 21.

[0088] In addition, the optical module may also include a third lens group 28, which is disposed in the incident light path of the first beam and at the first light-transmitting aperture. The first lens group 24 and the third lens group 28 can be combined to form a lens in the front-facing camera that includes multiple optical lenses. The third lens group 28 makes full use of the opening space of the first light-transmitting aperture on the display module, while the first lens group 24 utilizes the under-screen space between the substrate 25 of the display module and the optical module. By adjusting the first beam through the third lens group 28 and the first lens group 24, the first beam can be accurately projected onto the image sensor 21 to form a clear image. Furthermore, when the optical module is disposed in the terminal device, the third lens group 28 can make full use of the opening space of the light-transmitting aperture on the display module, while the first lens group 24 utilizes the under-screen space between the substrate 25 of the display module and the optical module, thereby reducing the size of the optical module. The third lens group 28 may include one or more concave lenses for converging the beam.

[0089] In this embodiment, the third mirror group 28 is used to converge the first light beam projected onto the third mirror group 28, that is, the third mirror group 28 is used to converge the first light beam incident on the optical module through the first light-passing aperture, and project the converged first light beam onto the beam-splitting surface 231. The arrangement of the third mirror group 28 can expand the field of view of the first light beam incident on the image sensor 21, so that the image sensor 21 can have a wider field of view when acquiring the image of the external first light beam, thereby enabling the image image on the image sensor 21 to contain more scene and details. Furthermore, the third mirror group 28 can also be used to diverge the second light beam projected onto the third mirror group 28, and emit the diverged second light beam.

[0090] In one embodiment, such as Figure 6 As shown, Figure 6 This is a front view of a display module 11 provided in an embodiment of this application. The display module 11 in this embodiment is provided with a first light-transmitting hole 111.

[0091] In the terminal device, when the beam splitter of the optical module is configured to reflect the first beam and transmit the second beam, and the light source emitter 22 is disposed on the substrate of the optical module, see [reference needed]. Figure 6The light source emitter 22 is located in the direction in which the first light beam enters the terminal device through the first light-transmitting hole 111 on the display module 11, while the image sensor 21 is positioned as follows: Figure 4 The under-screen space between the display module 11 and the substrate of the optical module shown, or as... Figure 5 When on the substrate shown, refer to Figure 6 The image sensor 21 is located on one side of the first light-transmitting hole 111. At this time, the light path of the first beam entering the optical module is shared with the light path of the second beam exiting the optical module. There is no need to set up a separate light path channel for the first beam or the second beam to enter, thereby reducing the number of light-transmitting holes opened on the display module 11, so that the terminal device 1 can achieve a more complete screen display.

[0092] In this embodiment, after the beam splitter adjusts the propagation directions of the externally input first beam and the second beam emitted from the light source emitter 22 in the optical module, the emission direction of the second beam is opposite to the incident direction of the first beam. That is, the emission path of the second beam and the incident path of the first beam overlap to a certain extent, thus achieving shared optical paths for the first and second beams. In this case, there is no need to set up separate optical path channels for the input of the first beam or the output of the second beam. Furthermore, the sharing of optical paths between the first and second beams does not affect the input effect of the first beam when it enters the terminal device, nor the emission effect of the second beam when it exits the terminal device, ensuring the shooting performance and face unlocking performance of the terminal device. Moreover, the sharing of optical paths between the two beams allows for the sharing of light-passing holes, thereby reducing the number of holes required on the display module 11 of the terminal device and reducing the area of ​​the perforated area. This allows the terminal device to achieve a more complete screen display, thereby improving the integrity of the image displayed on the display module 11 and the visual immersion of the user's viewing experience, and giving the terminal device a more refined appearance, thus enhancing the user experience.

[0093] In another implementation, such as Figure 7 As shown, Figure 7 This is a schematic diagram of another optical module provided in an embodiment of this application. In this embodiment, the optical module includes an image sensor 21, a light source emitter 22, a beam splitter, a substrate 25, a filter 27, and a third mirror group 28. The image sensor 21 is used to receive a first light beam having a first wavelength, and the light source emitter 22 is used to emit a second light beam having a second wavelength, wherein the first wavelength and the second wavelength are different.

[0094] In this embodiment, the beam splitter includes a fourth prism 233, and the fourth prism 233 includes a beam-splitting surface 231. For example... Figure 7 The fourth prism 233 is located on the propagation path of the first beam and the second beam, and both the first beam and the second beam can be projected onto the beam splitting surface 231 of the fourth prism 233.

[0095] A fourth prism 233 is disposed on the outgoing light path of the first beam entering the terminal device through the first light-transmitting aperture. The fourth prism 233 is used to transmit the first beam projected onto the beam-splitting surface 231 and emit the transmitted first beam. The image sensor 21 is disposed on the transmission light path of the first beam. Furthermore, the fourth prism 233 is also used to reflect the second beam projected onto the beam-splitting surface 231 and emit the reflected second beam. Since the reflection direction of the second beam after reflection is opposite to the incident direction of the first beam, the emitted second beam passes through the first light-transmitting aperture and exits the terminal device. For example, when the first beam is visible light and the second beam is infrared light, an infrared cutoff filter film can be deposited on the fourth prism 233 to form the beam-splitting surface 231. The infrared cutoff filter film is used to reflect the second beam in the infrared wavelength range and transmit the first beam in the visible wavelength range.

[0096] Compared to Figure 4 or Figure 5 In the embodiment provided, the optical module has a beam splitter 231 configured to reflect a first beam and transmit a second beam. A first prism including the beam splitter 231 and a light source emitter 22 are arranged in the emission direction of the first beam entering the terminal device through the first light aperture, and an image sensor 21 is arranged on one side of the first light aperture.

[0097] In this embodiment, since the beam splitter 231 is configured to transmit the first beam and reflect the second beam, the positions of the image sensor 21 and the light source emitter 22 in the optical module are adjusted. The image sensor 21 is placed on the substrate 25, and the fourth prism 233 including the beam splitter 231 and the image sensor 21 are placed in the emission direction of the first beam entering the terminal device through the first light-transmitting hole, and the light source emitter 22 is placed on one side of the first light-transmitting hole.

[0098] In this embodiment, the optical module further includes a second mirror group 29, which is disposed between the beam splitter 231 and the image sensor 21. The second mirror group 29 is used to converge the first light beam transmitted from the beam splitter 231 to the second mirror group 29 and adjust the propagation direction of the converged first light beam. The adjusted emission direction of the first light beam is parallel to the optical axis of the image sensor 21. The application of the second mirror group 29 in the optical module is equivalent to... Figure 4 or Figure 5 The application of the first lens group in the optical module in the embodiment will not be described in detail here.

[0099] Correspondingly, the application of the third lens group 28 and the filter 27 in the optical module can also be referenced. Figure 4 or Figure 5In the embodiments described, the third lens group 28 and the filter 27 are used in the optical module. Furthermore, in this application, the second lens group 29 and the third lens group 28 can be combined to form a lens in the front-facing camera that includes multiple optical lenses. The third lens group 28 fully utilizes the opening space of the first light-transmitting hole on the display module, and the second lens group 29 utilizes the under-screen space between the display module and the substrate 25 of the optical module. By adjusting the first light beam through the third lens group 28 and the second lens group 29, the first light beam can be accurately projected onto the image sensor 21 to form a clear image.

[0100] Furthermore, since the fourth prism 233 is used to reflect the second beam projected onto the beam-splitting surface 231 and transmit the first beam projected onto the beam-splitting surface 231, in order to ensure that the second beam, after being reflected by the beam-splitting surface 231 of the fourth prism 233, can pass through the first light-transmitting hole and exit to the terminal device, the angles at which the beam-splitting surface 231 of the fourth prism 233 and the light-emitting surface of the light source emitter 22 are placed in the optical module need to be designed. Specifically, the beam-splitting surface 231 of the fourth prism 233 forms a third angle A3 with the plane where the substrate 25 is located, and the light-emitting surface of the light source emitter 22 forms a fourth angle A4 with the plane where the substrate 25 is located. The fourth angle A4 increases as the third angle A3 increases.

[0101] Based on the above, Figure 7 The structure of the optical module shown describes the structure of the terminal device involved in this application. The optical module is disposed on the circuit board and is used to receive a first light beam with a first wavelength and emit a second light beam with a second wavelength, the first wavelength being different from the second wavelength. Because the propagation optical path of the image sensor 21 inside the optical module receiving the externally input first light beam is designed so that the optical path of the first light beam entering the optical module is shared with the optical path of the second light beam exiting the optical module, there is no need to set up a separate optical path channel for the first light beam to enter, thereby reducing the number of light-transmitting holes on the display module.

[0102] In one embodiment, such as Figure 8 As shown, Figure 8 This is a front view of another display module 11 provided in an embodiment of this application. The display module 11 of this embodiment is provided with a first light-transmitting hole 111.

[0103] In terminal device 1, when the beam splitter of the optical module is configured to transmit a first beam and reflect a second beam, and image sensor 21 is mounted on the substrate of the optical module, then as follows... Figure 8 As shown, when the image sensor 21 is located in the direction of the first light beam entering the terminal device through the first light-passing hole 111 on the display module 11, and the light source emitter 22 is disposed in the under-screen space between the display module 11 and the substrate of the optical module, as... Figure 8As shown, the light source emitter 22 is located on one side of the first light-passing aperture 111. At this time, the optical path of the first beam entering the optical module is shared with the optical path of the second beam exiting the optical module, and there is no need to set up a separate optical path channel for the first beam or the second beam to enter.

[0104] In such Figure 7 In the illustrated embodiment, when the beam splitter in the optical module is set as the fourth prism 233, since the beam splitting surface 231 of the fourth prism 233 is configured to transmit the first beam and reflect the second beam, relative to... Figure 4 and Figure 5 The optical module provided in this embodiment allows for adjustments to the positions of the image sensor 21 and the light source emitter 22 within the optical module. The image sensor 21 is mounted on the substrate 25. In this case, the application of the second mirror group 29 in the optical module is equivalent to the application of the first mirror group in the optical module described in the previous embodiment. This fully utilizes the under-screen space of the display module, reduces the size of the optical module, and improves the overall compactness of the terminal device. Furthermore, the optical module in this embodiment still achieves the overlap of the exit optical path of the second beam and the incident optical path of the first beam, thus enabling the sharing of optical paths between the first and second beams. Since there is no need to separately set up optical path channels for the input of the first beam or the output of the second beam, the optical module, when applied to a terminal device, can reduce the number of vias required on the display module of the terminal device. This improves the integrity of the image display on the display module and the user's visual immersion in the content viewed, resulting in a more refined appearance for the terminal device and enhancing the user experience.

[0105] Based on this, by reducing the number of through holes required on the display module, the area of ​​the holes on the display module is reduced, thereby increasing the proportion of the display area on the display module. This allows the terminal device to achieve a more complete screen display, which in turn improves the integrity of the image displayed on the display module and the visual immersion of the user's viewing experience. It also brings a more refined appearance to the terminal device, thereby improving the user experience.

[0106] In some embodiments, please refer to Figure 9 , Figure 9 This is a schematic diagram of the structure of another terminal device 1 provided in an embodiment of this application. For example... Figure 9 As shown, the terminal device 1 provided in this application embodiment includes a display module 11, a circuit board 14, and an optical module 2.

[0107] In this embodiment, the optical module 2 is disposed on the circuit board 14. The optical module 2 is used to receive a first light beam with a first wavelength and emit a second light beam with a second wavelength, the first wavelength being different from the second wavelength. Due to the design of the optical components inside the optical module 2, the light path of the second light beam exiting the optical module 2 is shared with the light path of the first light beam entering the optical module 2. Therefore, there is no need to set up a separate light path channel for the second light beam to exit, thereby reducing the number of light-transmitting holes on the display module 11. The display module 11 includes a first light-transmitting hole 111. When the first light beam and the second light beam share the same light path, they can share the first light-transmitting hole 111. That is, the first light-transmitting hole 111 is used for the first light beam to pass through and be projected onto the optical module 2, and the first light-transmitting hole 111 is also used for the second light beam to pass through and exit.

[0108] Furthermore, the terminal device 1 may also include a light source receiver 15, which is disposed on the circuit board 14 and is used to receive the second light beam. Therefore, the display module 11 also includes a second light-transmitting hole 112, which is used for the second light beam to pass through and be projected onto the light source receiver 15.

[0109] In terminal device 1, a light source emitter 22 emits a second light beam with a second wavelength. A first light-transmitting aperture 111 on the display module 11 allows the second light beam to pass through and exit. After the second light beam emitted from the light source emitter 22 is reflected on the face, a light source receiver 15 receives the second light beam and forms an image. A second light-transmitting aperture 112 on the display module 11 allows the second light beam to pass through and be projected onto the light source receiver 15. Thus, based on the image of the second light beam in the light source receiver 15, a three-dimensional face image is achieved by extracting the biometric features of the face image through an algorithm. This image is then compared with a pre-recorded face template, enabling the light source receiver 15 and the light source emitter in the optical module 2 to work together to achieve a face unlock function.

[0110] In optical module 2, the second beam emitted from the light source receiver 15 has an initial field of view, and the third mirror group at the first light aperture 111 acts as a diverging beam for the second beam. This increases the angular range that the second beam emitted by optical module 2 can cover, thereby increasing the field of view of the second beam. However, if the field of view of the second beam received by the light source receiver 15 is too small, it may not be able to completely cover the field of view of the diverged second beam, causing some of the second beam to be unreceived by the light source receiver 15. This can affect the 3D face unlock function, potentially leading to problems such as insufficient light signal intensity or incomplete image information.

[0111] In this embodiment, to ensure that the second beam receives as much of the second beam as possible when it passes through the second light aperture 112 and is projected onto the light source receiver 15, the field of view of the light source receiver 15 receiving the second beam, the beam divergence of the third mirror group, and the field of view of the second beam emitted by the light source emitter are designed. For example, the field of view of the second beam emitted by the light source emitter 22 is designed inversely based on the field of view of the light source receiver 15 receiving the second beam and the beam divergence of the third mirror group, so that the field of view of the light source receiver 15 receiving the second beam matches the field of view of the second beam finally emitted by the optical module 2. This matched field of view allows the light source receiver 15 to more accurately detect the information of the second beam, thereby enabling more precise measurement and analysis of the incident second beam. This reduces errors caused by the second beam deviating from the field of view of the light source receiver 15 or only receiving a portion of the light source receiver 15, thus improving the accuracy and reliability of the 3D face unlock function.

[0112] In addition, since the light source receiver 15 and the optical module 2 are arranged adjacent to each other on the circuit board 14, a light shield 16 can also be arranged on the circuit board 14. The light shield 16 is located between the light source receiver 15 and the optical module 2. The light shield 16 can prevent the second beam emitted by the light source emitter in the optical module 2 from being internally crosstalked to the light source receiver 15. That is, the second beam is directly transmitted from the under-screen space of the display module 11 to the light source receiver 15, which affects the imaging of the light source receiver 15.

[0113] In some embodiments, when the second beam is incident on the terminal device 1 and projected onto the light source receiver 15, it is not necessary to design a hole in the display module 11, such as... Figure 10 As shown, Figure 10 This is a schematic diagram of the structure of a display module 11 provided in an embodiment of this application.

[0114] In this embodiment, the display module 11 is provided with a first light-transmitting hole 111. When the incident light beam and the exit light beam share the same optical path, they can share the first light-transmitting hole 111. The display module 11 does not provide a second light-transmitting hole in the area corresponding to the light source receiver, but provides a light beam incident area 113. A local area of ​​the light beam incident area 113 is made of a light-transmitting material to form multiple light-transmitting channels in the light beam incident area 113. The light-transmitting channels are used for the second light beam to be projected to the light source receiver through the light-transmitting channels.

[0115] Specifically, since the display module 11 integrates multiple RGB pixel units, and these RGB pixel units are arranged in an orderly manner according to a specific array pattern, they collectively undertake the screen display function of the display module 11. The RGB pixel units in the beam incident area 113 are rearranged, such as selectively eliminating adjacent pixels of the same color, adjusting the spacing of originally closely connected red pixels to reduce the light blocking and superposition effect of pixels of the same color; or, reducing the size of the RGB pixel units in the beam incident area 113; or, improving the circuit layout of the beam incident area 113, such as redesigning the layout of the driving circuits and signal transmission lines around the pixels to reduce the coverage area of ​​circuit components on the display module 11. Based on this, local areas of the beam incident area 113 are no longer blocked by RGB pixel units or circuit components. Furthermore, local areas of the beam incident area 113 are made of light-transmitting material, so that the beam incident area 113 forms multiple light-transmitting channels for the second beam to enter.

[0116] In this embodiment, by setting a beam incident area 113 instead of setting a second light-transmitting hole on the display module 11, since there is no need to make a hole design in the beam incident area 113 on the display module 11, while the beam incident area 113 can still realize the display of the image, the multiple light-transmitting channels in the beam incident area 113 allow the second beam to pass through and be projected to the light source receiver, reducing the number of light-transmitting holes opened on the display module 11, so that the terminal device 1 can realize a more complete screen display, thereby improving the integrity of the image display on the display module 11 and the visual immersion of the user watching the content.

[0117] In this embodiment, after designing the propagation path of the beam inside the optical module 2 in the terminal device 1, the light path of the second beam emitted from the optical module 2 is shared with the light path of the first beam incident on the optical module 2. Therefore, it is not necessary to separately set up channels for the input of the first beam or the output of the second beam on the display module 11. By reducing the number of through holes required on the display module 11, the perforation area on the display module 11 is reduced, increasing the proportion of the display area on the display module 11. This reduces the perforation area on the display module 11, enabling the terminal device 1 to achieve a more complete screen display. This improves the integrity of the image display on the display module 11 and the user's visual immersion in the content, resulting in a more refined appearance for the terminal device 1 and enhancing the user experience.

[0118] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical module, characterized in that, The optical module includes: An image sensor for receiving a first light beam having a first wavelength; A light source emitter for emitting a second light beam having a second wavelength, wherein the first wavelength is different from the second wavelength; A beam splitter, the beam splitter including a beam splitting surface; The beam splitter is used to adjust the propagation direction of the first beam projected onto the beam splitter surface, and to project the first beam with the adjusted propagation direction onto the image sensor; The beam splitter is also used to adjust the propagation direction of the second beam projected onto the beam splitter surface, and to emit the second beam after the propagation direction has been adjusted. The emission direction of the adjusted second beam is opposite to the incident direction of the first beam.

2. The optical module according to claim 1, characterized in that, The beam splitter includes a first prism, and the first prism includes the beam splitting surface; The first prism is used to reflect the first beam projected onto the beam splitter and to emit the reflected first beam. The image sensor is disposed on the reflected light path of the first beam. The first prism is also used to transmit the second beam projected onto the beam splitting surface and to emit the transmitted second beam.

3. The optical module according to claim 2, characterized in that, The optical module further includes a first mirror group, which is disposed between the beam splitter and the image sensor; The first mirror group is used to converge the first beam reflected from the beam splitter to the first mirror group, and to adjust the propagation direction of the converged first beam. The emission direction of the adjusted first beam is parallel to the optical axis of the image sensor.

4. The optical module according to claim 3, characterized in that, The optical module further includes a second prism, which is disposed between the beam-splitting surface and the light source emitter; The second prism is used to adjust the propagation direction of the second beam projected onto the second prism, and to project the second beam with the adjusted propagation direction onto the beam splitting surface. The exit direction of the adjusted second beam through the beam splitting surface is opposite to the incident direction of the first beam.

5. The optical module according to claim 3 or 4, characterized in that, The optical module further includes a substrate, the light source emitter is disposed on the substrate, the beam splitting surface forms a first angle with the plane of the substrate, and the light incident surface of the image sensor forms a second angle with the plane of the substrate, the second angle increasing as the first angle increases.

6. The optical module according to claim 3 or 4, characterized in that, The optical module further includes a substrate and a third prism. The light source emitter and the image sensor are disposed on the substrate, and the third prism is disposed on the outgoing light path of the first beam emitted from the first mirror group. The third prism includes a reflective surface, which is used to reflect the first light beam projected onto the reflective surface to the image sensor.

7. The optical module according to claim 1, characterized in that, The beam splitter includes a fourth prism, and the fourth prism includes the beam splitting surface; The fourth prism is used to transmit the first beam projected onto the beam splitting surface and to emit the transmitted first beam. The image sensor is disposed on the transmission path of the first beam. The fourth prism is also used to reflect the second beam projected onto the beam splitter and to emit the reflected second beam.

8. The optical module according to claim 7, characterized in that, The optical module further includes a second mirror group, which is disposed between the beam splitter and the image sensor; The second mirror group is used to converge the first beam transmitted to the second mirror group by the beam splitter, and to adjust the propagation direction of the converged first beam. The emission direction of the adjusted first beam is parallel to the optical axis of the image sensor.

9. The optical module according to claim 7, characterized in that, The optical module further includes a substrate, the image sensor is disposed on the substrate, the beam splitting surface forms a third angle with the plane on which the substrate is located, and the light emitting surface of the light source emitter forms a fourth angle with the plane on which the substrate is located. The fourth angle increases as the third angle increases.

10. The optical module according to any one of claims 1 to 9, characterized in that, The optical module also includes a filter; The filter is disposed at the light incident point of the image sensor, and the filter is used to transmit the first light beam and reflect the second light beam.

11. The optical module according to any one of claims 1 to 10, characterized in that, The optical module also includes a third lens group; The third mirror group is disposed on the incident light path of the first beam. The third mirror group is used to converge the first beam projected onto the third mirror group and project the converged first beam onto the beam splitting surface. The third mirror group is also used to diverge the second beam projected onto the third mirror group and to emit the diverged second beam.

12. A terminal device, characterized in that, The terminal device includes a display module, a circuit board, and an optical module as described in any one of claims 1 to 11; The optical module is disposed on the circuit board. The optical module is used to receive a first light beam with a first wavelength and to emit a second light beam with a second wavelength, wherein the first wavelength is different from the second wavelength. The display module includes a first light-transmitting hole, which is used for the first light beam to pass through and be projected onto the optical module, and the first light-transmitting hole is also used for the second light beam to pass through and exit.

13. The terminal device according to claim 12, characterized in that, The terminal device further includes a light source receiver, which is disposed on the circuit board and is used to receive the second light beam.

14. The terminal device according to claim 13, characterized in that, The display module further includes a second light-transmitting hole, which is used for the second light beam to pass through and be projected onto the light source receiver.

15. The terminal device according to claim 13, characterized in that, The display module also includes a beam incident area, a portion of which is made of a light-transmitting material to form multiple light-transmitting channels in the beam incident area. These light-transmitting channels are used for the second beam to be projected onto the light source receiver through the light-transmitting channels.

Images